content/hp34970a_protocol.rst

Thu, 10 Nov 2022 16:45:50 +0100

author
David Douard <david.douard@sdf3.org>
date
Thu, 10 Nov 2022 16:45:50 +0100
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Fix a pelican warning on why.rst

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1 ==========================================================
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2 HP 34970A Data Acquisition Unit - communication protocol
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3 ==========================================================
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5 :Author: David Douard
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6 :Category: Electronics
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7 :Tags: HP, 34970A, HP34970A, DMM, repair, test equipment
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8 :series: HP 34970A repair
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9 :JavaScripts: default.js, WaveDrom.js
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10
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11 In order to build a replacement display for the HP34970A data
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12 acquisition unit, I needed to understand the communication protocol
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13 between the CPU board and the front panel assembly.
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15 General description
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16 ===================
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18 The unit is built with four boards:
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20 - A1 is the main bard, with the PSU, the main controller and the floating logic,
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22 - A2 is the front panel with the display and the keypad,
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24 - A3 is the backplane on which I/O modules are plugged,
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26 - A4 is the (optional) internal 6.5 digits DMM.
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27
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28 .. image:: {static}/images/hp34970a/block_diagram.svg
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29 :alt: System Block Diagram of the HP34970A.
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32 The commnucation between the different system blocks is done with
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33 asynchronous serial links. They use the rather uncommon bit rate of
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34 187500 baud, with a classic 8E1 schema (note the *even* parity bit).
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37 The CPU <-> Display Panel communication protocol
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38 ================================================
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40 The communication protocol between the main controller (CPU) board and
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41 the display panel (DP) consists in "datagrams" sent using the general
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42 pattern:
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44 - when a device (CPU or DP) wants to take control of the communication
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45 bus, it sends a ``Start of Transmission`` (SoT) signal (0x66),
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47 - each sent char (but the end of transmission) must be acknowledged
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48 (ack value may vary),
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50 - at the end of a communication, the initiator send a "End of
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51 Transmission" (EoT, 0x55). This sent value is not acknowledged.
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52
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53 - the keyboard can interrupt a CPU->DP communication in progress by
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54 not acknowledge a received byte, but sending a SoT instead of the
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55 expected ACK value,
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56
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57 - acknowledge values are:
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58
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59 - one-complement of the received SoT byte, so
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61 - 0x99 for the 0x66 SoT byte and
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62 - 0xCC for the 0x33 SoT byte.
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64 - 0x00 otherise
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66 - a special packet is sent by the Display Panel at startup, which SoT value is
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67 ``0x33``, which does not seem to follow the general pattern in which the first
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68 value after the SoT byte is the number of arguments.
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70 Initialization sequence
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71 -----------------------
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72
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73 The initialization transmission is:
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74
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75 .. wavedrom::
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76
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77 { signal: [
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78 {name: "CPU", wave: "zz5x5x5xx", data: ["0xCC", "0x00", "0x00"]},
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79 {name: "DP", wave: "z3x4x4x3x", data: ["0x33", "0x02", "0x00", "0x55"]},
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80 ]}
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81
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82 If a key is pressed during while powering the unit on, then the initialization
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83 of the Display Panel is frozen (with all elements of the display lit) until the
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84 key is released. In this case, the initialization packet adds the key code of
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85 that key, typically used with the Shift key pressed in to force a full test of
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86 the device (in this datagram, ``0x0C`` is the keycode of the Shift key):
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87
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88 .. wavedrom::
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89
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90 { signal: [
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91 {name: "CPU", wave: "zz5x5x5x5xx", data: ["0xCC", "0x00", "0x00", "0x00"]},
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92 {name: "DP", wave: "z3x4x4x4x3x", data: ["0x33", "0x02", "0xFF", "0x0C", "0x55"]},
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93 ]}
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95
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96 Shutdown sequence
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97 -----------------
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98
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99 .. wavedrom::
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100
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101 { signal: [
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102 {name: "Rx", wave: "z3x4x44|=4", data: ["0x66", "0x86", "0x55", "0x55","0x55"] },
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103 {name: "Tx", wave: "zx5x5xx", data: ["0x99", "0x00"] },
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104 ]}
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105
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106
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107 CPU -> DP trasmission
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108 ---------------------
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109
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110 The CPU->DP transmission protocol looks like:
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112 .. wavedrom::
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113
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114 { signal: [
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115 {name: "Rx", wave: "z3x4x4x=x=x|.=x3x", data: ["0x66", "CMD", "LEN", "D0", "D1", "Dn", "0x55"] },
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116 {name: "Tx", wave: "zx5x5x5x5x5x|.5x.", data: ["0x99", "0x00","0x00", "0x00", "0x00", "0x00"] },
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117 ]}
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118
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119 Two (or more) datagrams can be transmitted in a single "transmission",
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120 ie. without sending the EoT byte, eg.:
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121
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122 .. wavedrom::
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124 { signal: [
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125 {name: "Rx", wave: "z3x4x4x|=x3x4x|3x",
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126 data: ["0x66", "0x0C", "0x03", "D3", "0x66", "0x0A", "0x55"] },
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127 {name: "Tx", wave: "zx5x5x5x|5x5x5x|x",
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128 data: ["0x99", "0x00", "0x00", "0x00", "0x99", "0x00"] },
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129 ]}
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130
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131
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132 DP -> CPU transmission
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133 ----------------------
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134
68
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135 When the user press a key on the front panel, a slightly simpler "packet transmission" occurs:
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136
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137 .. wavedrom::
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138
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139 { signal: [
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140 {name: "Rx", wave: "zz5x5xx", data: ["0x99", "0x00"]},
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141 {name: "Tx", wave: "z3x4x3x", data: ["0x66", "KP", "0x55"]},
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142 ]}
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143
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144
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145 Commands
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146 ========
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147
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148 The known command bytes sent by the CPU for now are:
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149
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150 :0x00: show text on the main display. N arguments; the characters to display.
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151
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152 :0x0C: show text in the 'channels' area. 3 arguments; the digits to display.
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153
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154 :0x0A: indicators (or flags) to display. 4 arguments; the flag bytes.
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155
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156 :0x08: to set an indicator in low bright mode. 1 argument; the number of the
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157 indicator dimm.
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158
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159 :0x09: to set an indicator in hight bright mode. 1 argument; the number of the
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160 indicator to highlight.
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161
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162 :0x01: clear the 'shift' button. Typically sent as ``0x01 0x01 0x0E``. 1
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163 argument; 0x0E to clear the 'shift' flag. Other values unknown. Probably
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164 the bit position of the flag to clear.
111
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165
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166 :0x02: might be a reset or clear for the front panel (typically sent as
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167 ``0x02 0x01 0x0C`` packet). 1 argument; unknown.
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168
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169 :0x86: shutdown. 0 argument.
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170
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171 :0x0D: set char at pos dimm (eg 0D 01 02 55 = cursor on the 3rd char)
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172
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173 Sending data to the main display
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174 ================================
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175
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176 The main display consist in 13 17-segments digits, in which the
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177 character is displayed by a main 14-digits, and the punctuation with 3
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178 segments (2 dots and a comma, allowing to represent the signs ".",
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179 ",", ":" and ";"). Punctuation signs are also very close to the
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180 preceding chracters.
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181
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182 .. image:: {static}/images/hp34970a/digit.jpg
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183 :alt: 17-segments digit of the main display.
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184
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185 The command used to send text to the main display is ``0x00``. The
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186 character ``0x09`` (tabulation) has a special meaning: it marks the
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187 beginning and the end of a part of the text to be displayed darker
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188 than the usual. This is used to emphasis a portion of the displayed
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189 text. Also, as the punctuation signs do not consume a digit, the
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190 displayed text can be larger than 13 characters.
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191
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192
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193 Sending data to the Channels display
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194 ====================================
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195
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196 This area only allows to display 3 7-segments digits. The command is
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197 ``0x0C``, the payload is thus 3 bytes long.
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198
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199 .. image:: {static}/images/hp34970a/channel.jpg
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200 :alt: The display area dedicated to current channel.
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201 :align: center
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202
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203 Flags
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204 =====
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205
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206 The display also has several flags. Display flags are selected by
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207 sending the ``0x0A`` command. The payload is 4 bytes long. Each bit
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208 of these 4 bytes represent a flag on the display.
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209
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210 Let's consider the following (we don't represent the acknowledgements here):
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211
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212 .. wavedrom::
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213
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214 { signal: [
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215 {name: "Rx", wave: "z344====3x",
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216 data: ["0x66", "0x0A", "0x04", "F1", "F2", "F3", "F4", "0x55"]}
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217 ]}
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218
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219 The 29 flags I've identified are (should be complete):
68
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220
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221 .. wavedrom::
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222
68
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223 { signal: [
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224 {name: "bit", wave: "z========z",
68
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225 data: ["7", "6", "5", "4", "3", "2", "1", "0"]},
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226
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227 {name: "F1", wave: "z33333333z",
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228 data: ["1", "2", "Alarm", "3", "Channel", "Ch. frame", "Mx+B", "<Bell>"]},
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229 {name: "F2", wave: "z33333333z",
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230 data: ["AVG", "SHIFT", "OC", "4W", "Al. frame", "L", "4", "H"]},
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231 {name: "F3", wave: "z333=3333z",
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232 data: ["ERROR", "EXT", "ONCE", "", "MEM", "LAST", "MIN", "MAX"]},
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233 {name: "F4", wave: "z=3333333z",
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234 data: ["", "CONFIG", "SCAN", "MON", "VIEW", "*", "ADRS", "REMOTE"]},
68
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235 ],
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236 config: { hscale: 2 },
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237 }
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238
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239
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240 Keypad
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241 ======
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242
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243 the keycode byte consists in:
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244
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245 .. wavedrom::
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246
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247 {signal: [
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248
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249 {name: "bit", wave: "z========z",
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250 data: ["7", "6", "5", "4", "3", "2", "1", "0"]},
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251 {name: "KP", wave: "z344=....z",
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252 data: ["Knob", "Rel.", "Shift", "Key Code"]},
68
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253 ],
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254 config: { hscale: 1 },
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255 }
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256
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257 :Bit 5: is set when the key has been pressed while 'shift' indicator was stil
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258 active.
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259
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260 :Bit 6: is set when the key is released, and clear for the key pressed event.
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261
25cae2c53694 [hp34970a] fixes and improvements on the protocol description
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262 :Bit 7: of the key event byte is set high for the knob key events.
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263
68
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264
4fa6621fec0f [hp34970a] an article dedicted to the protocol
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265 The key codes are:
4fa6621fec0f [hp34970a] an article dedicted to the protocol
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266
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267 :0x00: View
4fa6621fec0f [hp34970a] an article dedicted to the protocol
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268 :0x01: Mon
4fa6621fec0f [hp34970a] an article dedicted to the protocol
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269 :0x02: Sto/Rcl
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270 :0x03: Scan
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271 :0x04: Alarm
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272 :0x05: Mx+B
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273 :0x06: Measure
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274 :0x07: Interval
4fa6621fec0f [hp34970a] an article dedicted to the protocol
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275 :0x08: Card Reset
4fa6621fec0f [hp34970a] an article dedicted to the protocol
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276 :0x09: Close
4fa6621fec0f [hp34970a] an article dedicted to the protocol
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277 :0x0A: Open
4fa6621fec0f [hp34970a] an article dedicted to the protocol
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278 :0x0B: Read
4fa6621fec0f [hp34970a] an article dedicted to the protocol
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279 :0x0C: Shift
4fa6621fec0f [hp34970a] an article dedicted to the protocol
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280 :0x0D: Write
4fa6621fec0f [hp34970a] an article dedicted to the protocol
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281 :0x0E: Left
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282 :0x0F: Right
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283
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284 :0x10: Advanced
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285 :0x11: Step
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286
111
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287 :0x80: Knob right
25cae2c53694 [hp34970a] fixes and improvements on the protocol description
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288 :0x81: Knob left

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