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Useful information
The following information is supplied elsewhere in this user's guide but is repeated here as a quick reference aid. Each section is headed by the appropriate section number indicating where the original information can be found.
Commands and responses
Code | As a command to ACC2-3 | As a response from ACC2-3 |
|---|---|---|
A | Change cycle enable | Possible responses to rack status request |
B | - | Possible responses to rack status request |
C | Rack status request | Possible responses to rack status request |
D | Datum mode select | Possible responses to rack status request |
E | - | Possible responses to rack status request |
F | - | Possible responses to rack status request |
G | Mechanism lock / unlock | Lock / unlock complete |
H | Probe inhibit (1) | - |
I | Probe inhibit (2) | - |
J | Probe enable | - |
K | Reset | Datum mode 1 |
L | - | Datum mode 2 |
M | Change cycle disable | Change cycle disabled |
N | - | Change cycle and probe disabled |
O | - | - |
P | - | Parked state |
Q | - | Change cycle started |
R | Self test | Rack disconnected |
S | Autochange status request | Stand-alone mode probe enabled |
T | - | Stand-alone mode disabled |
U | - | - |
V | Version request 1 | - |
W | Version request 2 | - |
X | - | Rack overtravelled |
Y | Mechanism lock | Probe enabled |
Z | Mechanism unlock | Probe disabled |
Command C: Rack status request
This command requests the status of the ACR1. The response will be a string of four ASCII characters as shown below:
| (i) | (ii) | CR | LF |
(i) and (ii) will be HEX code in ASCII format.
Hex codes
Hex | Binary | Hex | Binary |
|---|---|---|---|
0 | 0000 | 8 | 1000 |
1 | 0001 | 9 | 1001 |
2 | 0010 | A | 1010 |
3 | 0011 | B | 1011 |
4 | 0100 | C | 1100 |
5 | 0101 | D | 1101 |
6 | 0110 | E | 1110 |
7 | 0111 | F | 1111 |
(i) This command specifies the state of the infra-red beams, rack overtravel and rack connected flags in the following formats (high for significance).
Rack status flags
Flag number | 7 | 6 | 5 | 4 |
Meaning | Not over-travelled | Front beam made | Rear beam made | Rack connected |
(ii) This command specifies the position of the motor-driven screwdrivers (high for significance).
Rack status flags
Flag number | 3 | 2 | 1 | 0 |
Meaning | Locked | Backed off | Intermediate | Unlocked |
e.g. | F4 = Rack ready, screwdrivers locked and backed off ready to receive a head and probe combination. |
F1 = Rack ready, screwdrivers in unlocked position ready to receive an unloaded head. |
Responses from ACC2-3
Normal status messages
| Status | Message |
|---|---|
Datum mode 1 | K0 |
Datum mode 2 | L0 |
Change cycle started | Q0 |
Parked state | P0 |
Cycle lock/unlock complete | G0 |
Change cycle disabled | M0 |
Change cycle and probe disabled | N0 |
CMM control probe enabled | Y0 |
CMM control probe disabled | Z0 |
Stand-alone mode probe enabled | S0 |
Stand-alone probe disabled | T0 |
Error status messages
State | Message |
|---|---|
Lock mechanism error | Q1 |
Lid time-out error | Q3 |
G message not received | Q4 |
Command not acceptable | Y5 * |
Excessive entry speed | Q6 |
Invalid command | Y7 * |
Rack overtravel | X8 |
Rack not connected | R9 |
Lock operation aborted | YA * |
Change cycle operation aborted | YB * |
The first character is the state in which the error occurred, the second character is the error code.
° These errors do not cause the system to remain in error mode, they are reported and the system returns to the previous mode.
* These error messages can have a different status byte (eg Q5, ZB).
Mode 4 - Error mode
LED errors
* These LEDs are ON so that a unique display is given for each error.
— Present mode or status.
System status
