Campbell Scientific CR10X CR10X Measurement and Control System - Page 16

V, Power Ground G,

Page 16 highlights

CR10X OVERVIEW OV1.1.1 ANALOG INPUTS The terminals labeled 1H to 6L are analog inputs. These numbers refer to the high and low inputs to the differential channels 1 through 6. In a differential measurement, the voltage on the H input is measured with respect to the voltage on the L input. When making singleended measurements, either the H or L input may be used as an independent channel to measure voltage with respect to the CR10X analog ground (AG). The single-ended channels are numbered sequentially starting with 1H; e.g., the H and L sides of differential channel 1 are single-ended channels 1 and 2; the H and L sides of differential channel 2 are single-ended channels 3 and 4, etc. (The blue single-ended channel numbers do NOT appear on older wiring panels). OV1.1.2 EXCITATION OUTPUTS The terminals labeled E1, E2, and E3 are precision, switched excitation outputs used to supply programmable excitation voltages for resistive bridge measurements. DC or AC excitation at voltages between -2500 mV and +2500 mV are user programmable (Section 9). OV1.1.3 PULSE INPUTS The terminals labeled P1 and P2 are the pulse counter inputs for the CR10X. They are programmable for high frequency pulse, low level AC, or switch closure (Section 9, Instruction 3). OV1.1.4 DIGITAL I/O PORTS Terminals C1 through C8 are digital Input/Output ports. On power-up they are configured as input ports, commonly used for reading the status of an external signal. High and low conditions are: 3V < high < 5.5V; -0.5V < low < 0.8V. Configured as outputs the ports allow on/off control of external devices. A port can be set high (5V ± 0.1V), set low (

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
  • 94
  • 95
  • 96
  • 97
  • 98
  • 99
  • 100
  • 101
  • 102
  • 103
  • 104
  • 105
  • 106
  • 107
  • 108
  • 109
  • 110
  • 111
  • 112
  • 113
  • 114
  • 115
  • 116
  • 117
  • 118
  • 119
  • 120
  • 121
  • 122
  • 123
  • 124
  • 125
  • 126
  • 127
  • 128
  • 129
  • 130
  • 131
  • 132
  • 133
  • 134
  • 135
  • 136
  • 137
  • 138
  • 139
  • 140
  • 141
  • 142
  • 143
  • 144
  • 145
  • 146
  • 147
  • 148
  • 149
  • 150
  • 151
  • 152
  • 153
  • 154
  • 155
  • 156
  • 157
  • 158
  • 159
  • 160
  • 161
  • 162
  • 163
  • 164
  • 165
  • 166
  • 167
  • 168
  • 169
  • 170
  • 171
  • 172
  • 173
  • 174
  • 175
  • 176
  • 177
  • 178
  • 179
  • 180
  • 181
  • 182
  • 183
  • 184
  • 185
  • 186
  • 187
  • 188
  • 189
  • 190
  • 191
  • 192
  • 193
  • 194
  • 195
  • 196
  • 197
  • 198
  • 199
  • 200
  • 201
  • 202
  • 203
  • 204
  • 205
  • 206
  • 207
  • 208
  • 209
  • 210
  • 211
  • 212
  • 213
  • 214
  • 215
  • 216
  • 217
  • 218
  • 219
  • 220
  • 221
  • 222
  • 223
  • 224
  • 225
  • 226
  • 227
  • 228
  • 229
  • 230
  • 231
  • 232
  • 233
  • 234
  • 235
  • 236
  • 237
  • 238
  • 239
  • 240
  • 241
  • 242
  • 243
  • 244
  • 245
  • 246
  • 247
  • 248
  • 249
  • 250
  • 251
  • 252
  • 253
  • 254
  • 255
  • 256
  • 257
  • 258
  • 259
  • 260
  • 261
  • 262
  • 263
  • 264
  • 265
  • 266
  • 267
  • 268
  • 269
  • 270
  • 271
  • 272
  • 273
  • 274
  • 275
  • 276
  • 277
  • 278
  • 279
  • 280
  • 281
  • 282
  • 283
  • 284
  • 285
  • 286
  • 287
  • 288
  • 289
  • 290
  • 291
  • 292
  • 293
  • 294
  • 295
  • 296
  • 297
  • 298
  • 299
  • 300
  • 301
  • 302
  • 303
  • 304
  • 305
  • 306
  • 307
  • 308
  • 309
  • 310
  • 311
  • 312
  • 313
  • 314
  • 315
  • 316
  • 317
  • 318
  • 319
  • 320
  • 321
  • 322
  • 323
  • 324
  • 325
  • 326
  • 327
  • 328
  • 329
  • 330
  • 331
  • 332
  • 333
  • 334
  • 335
  • 336
  • 337
  • 338
  • 339
  • 340
  • 341
  • 342
  • 343
  • 344
  • 345
  • 346
  • 347
  • 348
  • 349
  • 350
  • 351
  • 352
  • 353
  • 354
  • 355
  • 356
  • 357
  • 358
  • 359
  • 360
  • 361
  • 362

CR10X OVERVIEW
OV-4
OV1.1.1
ANALOG INPUTS
The terminals labeled 1H to 6L are analog
inputs.
These numbers refer to the high and
low inputs to the differential channels 1 through
6.
In a differential measurement, the voltage on
the H input is measured with respect to the
voltage on the L input.
When making single-
ended measurements, either the H or L input
may be used as an independent channel to
measure voltage with respect to the CR10X
analog ground (AG).
The single-ended
channels are numbered sequentially starting
with 1H; e.g., the H and L sides of differential
channel 1 are single-ended channels 1 and 2;
the H and L sides of differential channel 2 are
single-ended channels 3 and 4, etc.
(The blue
single-ended channel numbers do NOT appear
on older wiring panels).
OV1.1.2
EXCITATION OUTPUTS
The terminals labeled E1, E2, and E3 are
precision, switched excitation outputs used to
supply programmable excitation voltages for
resistive bridge measurements.
DC or AC
excitation at voltages between -2500 mV and
+2500 mV are user programmable (Section 9).
OV1.1.3
PULSE INPUTS
The terminals labeled P1 and P2 are the pulse
counter inputs for the CR10X.
They are
programmable for high frequency pulse, low
level AC, or switch closure (Section 9,
Instruction 3).
OV1.1.4
DIGITAL I/O PORTS
Terminals C1 through C8 are digital
Input/Output ports.
On power-up they are
configured as input ports, commonly used for
reading the status of an external signal.
High
and low conditions are:
3V < high < 5.5V; -0.5V
< low < 0.8V.
Configured as outputs the ports allow on/off
control of external devices.
A port can be set
high (5V
±
0.1V), set low (<0.1V), toggled or
pulsed (Sections 3, 8.3, and 12).
Ports C6 through C8 can be configured as
pulse counters for switch closures (Section 9,
Instruction 3) or used to trigger subroutine
execution (Section 1.1.2).
OV1.1.5
ANALOG GROUND (AG)
The AG terminals are analog grounds, used as
the reference for single-ended measurements
and excitation return.
OV1.1.6
12V, POWER GROUND (G), AND
EARTH TERMINALS
The 12V and power ground (G) terminals are
used to supply 12V DC power to the datalogger.
The extra 12V and G terminals can be used to
connect other devices requiring unregulated
12V power.
CAUTION:
The CR10X does not regulate the
voltage to the 12 V terminals.
The 12 V
terminals are connected directly to the 12 V
power in terminal.
Any voltage regulation must
be done by the power supply (Section 14).
The G terminals are also used to tie cable
shields to ground, and to provide a ground
reference for pulse counters and binary inputs.
The G terminals are directly connected to the
Earth terminal.
For protection against transient
voltage spikes, Earth should be connected to a
good earth ground (Section 14.7.1).
OV1.1.7
5V OUTPUTS
The two 5V (
±
0.2%) outputs are commonly
used to power peripherals such as the QD1
Incremental Encoder Interface, AVW1 or AVW4
Vibrating Wire Interface.
The 5V outputs are common with pin 1 on the 9
pin serial connector;
200 mA is the maximum
combined output.
OV1.1.8
SERIAL I/O
The 9 pin serial I/O port contains lines for serial
communication between the CR10X and
external devices such as computers, printers,
Storage Modules, etc.
This port does NOT
have the same configuration as the 9 pin
serial ports currently used on many personal
computers
.
It has a 5VDC power line which is
used to power peripherals such as the Storage
Modules or the DC112 Phone Modem.
The
same 5VDC supply is used for the 5V outputs on
the lower terminal strip.
Section 6 contains
technical details on serial communication.
OV1.1.9
SWITCHED 12 VOLT
The switched 12 volt output can be used to
power sensors or devices requiring an